Robert Nystrom
11b81715ad
Change-Id: I7b5e5dd768c87f28848ee02050582d23f3604cb1 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/426286 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
78 lines
2.9 KiB
Dart
78 lines
2.9 KiB
Dart
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:io';
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import 'package:analyzer/dart/analysis/session.dart';
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import 'package:analyzer/dart/element/type.dart';
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import 'package:analyzer/file_system/physical_file_system.dart';
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import 'package:analyzer/src/dart/analysis/analysis_context_collection.dart';
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/// Wrapper class for some static utilities.
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class GenUtil {
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// Picks a top directory (command line, environment, or current).
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static String getTop(String? top) {
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if (top == null || top == '') {
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top = Platform.environment['DART_TOP'];
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}
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if (top == null || top == '') {
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top = Directory.current.path;
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}
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return top;
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}
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// Create an analyzer session.
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static AnalysisSession createAnalysisSession([String? dartTop]) {
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// Set paths. Note that for this particular use case, packageRoot can be
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// any directory. Here, we set it to the top of the SDK development, and
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// derive the required sdkPath from there.
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final packageRoot = getTop(dartTop);
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final sdkPath = '$packageRoot/sdk';
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// This does most of the hard work of getting the analyzer configured
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// correctly. Typically the included paths are the files and directories
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// that need to be analyzed, but the SDK is always available, so it isn't
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// really important for this particular use case. We use the implementation
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// class in order to pass in the sdkPath directly.
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final provider = PhysicalResourceProvider.INSTANCE;
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final collection = AnalysisContextCollectionImpl(
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includedPaths: <String>[packageRoot],
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excludedPaths: <String>[packageRoot + '/pkg/front_end/test'],
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resourceProvider: provider,
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sdkPath: sdkPath,
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);
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return collection.contexts[0].currentSession;
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}
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}
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extension DartTypeExtension on DartType {
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/// Returns an approximation of the [DartType] code, suitable for this tool.
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String get asCode {
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final type = this;
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if (type is DynamicType) {
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return 'dynamic';
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} else if (type is FunctionType) {
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final parameters = type.formalParameters.map((e) => e.type.asCode);
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return type.returnType.asCode + ' Function($parameters)';
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} else if (type is InterfaceType) {
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final typeArguments = type.typeArguments;
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if (typeArguments.isEmpty ||
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typeArguments.every((t) => t is DynamicType)) {
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return type.element3.name3!;
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} else {
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final typeArgumentsStr = typeArguments.map((t) => t.asCode).join(', ');
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return '${type.element3.name3!}<$typeArgumentsStr>';
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}
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} else if (type is NeverType) {
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return 'Never';
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} else if (type is TypeParameterType) {
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return type.element3.name3!;
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} else if (type is VoidType) {
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return 'void';
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} else {
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throw UnimplementedError('(${type.runtimeType}) $type');
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}
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}
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}
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